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Epilepsy is primarily characterized by unpredictable seizures, either provoked by an identifiable factor, such as injury or illness, or unprovoked, occurring spontaneously without apparent cause.
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Tachyarrhythmias are a type of dysrhythmia where the heart rate exceeds 100 beats per minute. Here are some common types of tachyarrhythmias:Sinus TachycardiaSinus tachycardia originates from increased impulses from the sinus node, leading to an elevated heart rate. It is often triggered by stress, fever, or exercise.Patients may experience palpitations, a sensation of a racing heart, dizziness, and chest discomfort.Causes and Risk Factors: Common causes include physical exertion, emotional...
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Epilepsy ll: Types01:22

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Recurrent seizures, stemming from abnormal electrical activity in the brain, are the defining characteristic of epilepsy, a chronic neurological condition. Because seizure features vary greatly, epilepsy is classified using two systems: by seizure type and by epilepsy syndromes. These classifications enable clinicians to describe seizure patterns and select suitable treatment strategies.I. Classification by Seizure Type1. Focal EpilepsyFocal epilepsy begins in one hemisphere of the brain.
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Seizures are sudden bursts of abnormal electrical discharge in the brain that interfere with normal function. They are commonly divided into three groups: focal seizures, generalized seizures, and other types that do not fit neatly into either category.Focal SeizuresFocal seizures begin in a single brain region. When awareness is preserved, they are called focal aware seizures and may cause sensations such as tingling, unusual smells, or flashing lights. When awareness is impaired, they are...
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Updated: Apr 28, 2026

Tilt Testing with Combined Lower Body Negative Pressure: a "Gold Standard" for Measuring Orthostatic Tolerance
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Classifying syncope.

Dirk P Saal, J Gert van Dijk

    Autonomic Neuroscience : Basic & Clinical
    |June 2, 2014
    PubMed
    Summary
    This summary is machine-generated.

    Defining syncope is crucial for medical clarity. Syncope, a transient loss of consciousness (TLOC), is specifically caused by cerebral hypoperfusion, distinguishing it from other TLOC causes like seizures.

    Keywords:
    ClassificationSyncopeTransient loss of consciousness

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    Area of Science:

    • Cardiology
    • Neurology
    • Medical Definitions

    Background:

    • Existing definitions of syncope are often ambiguous, leading to confusion in clinical practice and research.
    • Published definitions frequently use 'syncope' broadly for transient loss of consciousness (TLOC), yet imply a narrower concept.
    • This ambiguity complicates accurate diagnosis and treatment of TLOC disorders.

    Purpose of the Study:

    • To provide an unambiguous definition of syncope.
    • To differentiate syncope from other forms of transient loss of consciousness (TLOC).
    • To clarify diagnostic criteria for syncope in medical research and teaching.

    Main Methods:

    • Review of existing medical literature and definitions of syncope.
    • Analysis of the ESC-classification (2001) and its distinction between TLOC and syncope.
    • Comparative description of syncope and other TLOC etiologies.

    Main Results:

    • Syncope is precisely defined as TLOC resulting from cerebral hypoperfusion.
    • This definition distinguishes syncope from other TLOC causes, such as epileptic seizures and psychogenic attacks.
    • The study clarifies the specific criteria for identifying syncope.

    Conclusions:

    • An unambiguous definition of syncope, emphasizing cerebral hypoperfusion, is essential.
    • Clear definitions improve patient care, research accuracy, and medical education.
    • Distinguishing syncope from other TLOCs is critical for appropriate medical management.